Fertilizer-Burn on rubber plant
What's Happening
Ficus elastica has moderate nutrient needs and can suffer from fertilizer burn when salts accumulate in soil faster than the plant can absorb them. Excess nitrogen causes rapid cell expansion that tissues cannot support, leading to brown, crispy leaf margins and tips. Salt buildup creates osmotic stress that prevents water uptake, mimicking drought symptoms even when soil is moist. Burn is most common with synthetic fertilizers applied too frequently or at excessive concentrations.
How to Fix It
- 1
Flush soil with 3x pot volume of water to leach excess salts
- 2
Stop fertilizing immediately until plant recovers (4-6 weeks)
- 3
Switch to half-strength balanced fertilizer (10-10-10) applied monthly during growing season only
- 4
Water thoroughly before fertilizing to dilute concentration
- 5
Never fertilize dry soil - always water first
- 6
Remove damaged leaf portions with sterile scissors - do not remove entire leaf if partially green
How to Prevent It
Use half-strength liquid fertilizer monthly during spring/summer only. Skip fertilizing in fall/winter when growth slows. Always water soil thoroughly before applying fertilizer. Flush soil every 3-4 months in hard water areas. Use organic fertilizers which release nutrients more slowly.